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  • insect
  • aphid or plant louse, tiny, usually green, soft-bodied, pear-shaped insect injurious to vegetation. (factmonster.com)
  • The soybean aphid possesses a heteroecious holocyclic life cycle, which means the insect alternates hosts and undergoes sexual reproduction for at least part of its life cycle. (wikipedia.org)
  • An aphid is a type of sap-feeding insect. (wikipedia.org)
  • Fauna Europaea lists six subspecies: A. f. cirsiiacanthoidis A. f. eryngii A. f. evonymi A. f. fabae A. f. mordvilkoi A. f. solanella The black bean aphid is a small, soft-bodied insect that has specialised piercing and sucking mouthparts which are used to suck the juice from plants. (wikipedia.org)
  • This aphid is usually seen in large numbers and is a tiny, plump insect about two millimetres long with a small head and bulbous abdomen. (wikipedia.org)
  • The beech blight aphid (Grylloprociphilus imbricator) is a small insect in the order Hemiptera that feeds on the sap of American beech trees. (wikipedia.org)
  • In addition to survivability in sub zero temperatures, the aphids are also capable of rapid cold hardiness (RCH) which allows an insect to develop protection against sudden sub freezing temperatures. (wikipedia.org)
  • Woolly Aphids
  • Many of the numerous species of woolly aphids have only one host plant species, or alternating generations on two specific hosts. (wikipedia.org)
  • Aphidounguis - Byrsocryptoides - Colopha - Colophina - Eriosoma - Gharesia - Hemipodaphis - Kaltenbachiella - Paracolopha - Schizoneurata - Schizoneurella - Siciunguis - Tetraneura - Zelkovaphis Aloephagus - Aploneura - Asiphonella - Baizongia - Chaetogeoica - Dimelaphis - Forda - Geoica - Geopemphigus - Kaburagia - Melaphis - Nurudea - Paracletus - Rectinasus - Schlechtendalia - Slavum - Smynthurodes - Tramaforda Ceratopemphigiella - Ceratopemphigus - Clydesmithia - Cornaphis - Diprociphilus - Epipemphigus - Formosaphis - Gootiella - Grylloprociphilus - Mimeuria - Mordwilkoja - Neopemphigus - Neoprociphilus - Pachypappa - Pachypappella - Patchiella - Pemphigus - Prociphilus - Thecabius - Tiliphagus - Uichancoella Woolly aphids feed by inserting their needle-like mouthparts into plant tissue to withdraw sap. (wikipedia.org)
  • As a result of feeding on the sap, woolly aphids produce a sticky substance known as honeydew, which can lead to sooty mold on the plant. (wikipedia.org)
  • Woolly aphids generally are not much cause for alarm, although they can cause rather unsightly damage to plants, which is particularly a problem for growers of ornamentals. (wikipedia.org)
  • Further minor damage can be caused by the honeydew that woolly aphids secrete, which is difficult to remove. (wikipedia.org)
  • populations
  • By midsummer, the number of predators and parasites has built up and aphid populations cease to expand. (wikipedia.org)
  • Isolated populations are present along streambanks in Saskatchewan and Alberta, along Lake Timiskaming in northern Ontario, and along the Maine-New Brunswick border, though this latter population is now severely threatened as the tree is a host for an aphid that menaces the local potato crop and so many of the trees have been cut down. (wikipedia.org)
  • galls
  • As the leaf grows, the aphid injects it with a substance, possibly an enzyme or hormone, that causes that the galls to form around her. (wikipedia.org)
  • Pemphigus betae, also known as the sugarbeet root aphid, is a species of gall-forming aphid that forms galls specifically on the commonly found Narrowleaf Cottonwood (aka the Willow-leaved Poplar tree), Populus angustifolia. (wikipedia.org)
  • There is intense competition between Pemphigus stem mothers over leaf choice - galls formed on larger leaves have higher stem mother weight, more aphids overall, and a lower probability of being aborted. (wikipedia.org)
  • The hawthorn-carrot aphid migrates to its primary host in late summer and forms red, curling galls on its leaves. (wikipedia.org)
  • exude
  • Most aphids have a pair of cornicles (or "siphunculi"), abdominal tubes through which they exude droplets of a quick-hardening defensive fluid containing triacylglycerols, called cornicle wax. (wikipedia.org)
  • greenfly
  • Macrosiphum hellebori, more commonly known as Hellebore aphid or greenfly, is a sap feeding aphid that infests the flowers and foliage of hellebore plants. (wikipedia.org)
  • predators
  • This, coupled with late emergence of aphids in many areas, prompted many aphids to dodge predators. (agriculture.com)
  • This species of aphid only affect hellebores and are most active in March and April when the hellebores are flowering and when few aphid predators are around, though they may infest during any time of the year. (wikipedia.org)
  • North America
  • The soybean aphid was first documented in North America in Wisconsin in July 2000. (wikipedia.org)
  • 2004) noted that the soybean aphid probably arrived in North America earlier than 2000, but remained undetected for a period of time. (wikipedia.org)
  • bodies
  • The aphids themselves are a light bluish color with bodies covered with long, white, waxy filaments giving them a woolly appearance. (wikipedia.org)
  • outbreaks
  • These tools don't protect against outbreaks in the prime aphid season of late-July and August, though. (agriculture.com)
  • In two studies, the quantity of overwintering eggs had a strong positive correlation with the severity of soybean aphid outbreaks in the following spring. (wikipedia.org)
  • relatively
  • a Sparrow equivalent, and the AA-8 Aphid , a relatively small missile for close-in use, were introduced during the 1970s. (britannica.com)
  • This cycle allows the aphid to increase its population dramatically in a relatively short period of time. (wikipedia.org)
  • antennae
  • Aphids have antennae with as many as six segments. (wikipedia.org)
  • On the primary host, these aphids are about 2 mm (0.08 in) long, with short antennae and short siphunculi, greenish-grey and dusted with wax particles. (wikipedia.org)
  • fecundity
  • Additionally, alate aphids incur other disadvantages: if aphids fly then they may incur an additional cost in that their potential fecundity is further reduced and there is a further delay in the onset of reproduction. (wikipedia.org)
  • symptoms
  • Inspect the underside of the mint leaves for aphid symptoms. (gardenguides.com)
  • The result of being a host of an aphid are damages through nutrient drainage which develops into symptoms such as chlorosis, necrosis, wilting, stunting and other growth impairment. (wikipedia.org)
  • parasites
  • Several parasites are known to attack this aphid and it is thought that they will in time be effective in reducing the population numbers of aphids. (wikipedia.org)
  • destructive
  • Marigolds keep potatoes, strawberries, tomatoes, eggplants as well as roses and most types of bulbs safe from the destructive aphid. (gardenguides.com)
  • phloem
  • The aphid further increases the nutritional drainage of the host plant through eliciting an increase in essential amino acid in the phloem sap by triggering a breakdown of proteins in the host plant. (wikipedia.org)
  • leaves
  • Aphids feed by inserting their beaks into stems, leaves, or roots, and sucking the plant juices. (factmonster.com)
  • Spray the top and underneath the leaves to eliminate aphids that are hiding deep within the weeds or plants. (gardenguides.com)
  • grow it around rose bushes to stop aphids from harming their delicate leaves and flowers. (gardenguides.com)
  • Growing chervil near your lettuce prevents aphids from eating the leaves. (gardenguides.com)
  • The saliva of this aphid is toxic to the plant and causes whitish striping on cereal leaves. (wikipedia.org)
  • The aphids tend to concentrate on the growing tips of plants, young leaves, shoots, flowers and developing seed pods. (wikipedia.org)
  • Aphids will start their feeding from the outside the flowers, beginning at the leaves and then moving towards the flower petals of the hellebore. (wikipedia.org)
  • entomologist
  • Entomologist Alain Robichon at the Sophia Agrobiotech Institute in Sophia Antipolis, France, and his colleagues suggest that, in aphids, these pigments can absorb energy from the Sun and transfer it to the cellular machinery involved in energy production. (neatorama.com)
  • The hawthorn-carrot aphid was first described by the German entomologist Johann Heinrich Kaltenbach in 1843. (wikipedia.org)
  • crop
  • Nasturtium is a trap crop for aphids and works well when grown near cabbage, radishes and under fruit trees. (gardenguides.com)